Discover new ways to solve problems and practice with our fun games! Mental arithmetic has never been so exciting thanks to our app: get titles, collect stars and win trophies. The application is intended for a wide audience + children and adults + and helps to master the basics of arithmetic and mathematics. It also helps to improve and maintain your brain abilities by solving problems. + Solve as many problems as possible in less than 60 seconds + Train indefinitely and without time constraint + PRO VERSION: review and improve on techniques where you made mistakes + Solve as many puzzles as possible in less than 60 seconds + Visualize your current score and your best score + Evaluate players from your watch + Open the app on your mobile device from your watch